JP2010506445A - Transmission and reception of system information when connectivity or attachment points change in a mobile communication system - Google Patents

Abstract

A method for notifying a mobile terminal about system information specific to a destination cell in order to facilitate a mobility procedure such as handover or cell reselection in a mobile communication system. Furthermore, a radio resource control device, a mobile terminal, and a system including the radio resource control device and the mobile terminal are provided. The present invention proposes an improvement of the current mobility procedure so as to reduce the interruption time associated with the above procedure. More particularly, at least one pointer to system information specific to the destination cell, which indicates to the mobile terminal system information in the destination cell related to the execution of system access and / or mobility procedures, a handover indication or connection It is proposed to include in control messages such as release messages. Furthermore, a part of the system information specific to the destination cell can be included in the control message.

Description

  The present invention relates to a method for notifying a mobile terminal about system information specific to a destination cell in order to facilitate a mobility procedure such as handover or cell reselection in a mobile communication system. Furthermore, a radio resource control device, a mobile terminal, and a system including the radio resource control device and the mobile terminal are provided.

  W-CDMA (Wideband Code Division Multiple Access) is a radio interface for the IMT-2000 system (International Mobile Telecommunication System) standardized for use as a third generation radio mobile communication system. is there. W-CDMA provides various services such as voice service and multimedia mobile communication service in a flexible and efficient manner. Standardization organizations in Japan, Europe, the United States, and other countries have jointly developed the 3rd Generation Partnership Project (3GPP standardization project) to create a common radio interface specification for W-CDMA. I organized a project called

  The standardized European version of IMT-2000 is commonly referred to as UMTS (Universal Mobile Telecommunication System). The first release of the UMTS specification was published in 1999 (Release 99). Since then, standard improvements have been standardized several times by 3GPP in Release 4, Release 5, and Release 6.

  In recent years, 3GPP has begun to consider the next major stage or development of the 3G standard to ensure the long-term competitiveness of 3G. 3GPP has recently launched a research item called “Evolved UTRA and UTRAN” —more well known as “Long Term Evolution (LTE)”. This study seeks to find ways to achieve a significant leap in performance in order to improve service delivery and reduce costs for users and carriers. Opinions converge in the direction of using Internet Protocol (IP) for mobility control, and it is generally assumed that all future services will be IP-based. Therefore, the focus of the above development is on strengthening the packet switched (PS) field.

The main purpose of the above development is, as already mentioned, to further improve service provision and reduce costs for users and carriers. In more detail, some of the important performance, capacity and deployment requirements for long-term development (LTE) include:
-Significantly faster data transmission speed compared to HSDPA and HSUPA (target maximum data transmission speed of 100 Mbps or higher on the downlink and 50 Mbps or higher on the uplink is assumed)
・ High data transmission speed in wide area coverage ・ Significantly reduced latency in user plane to improve performance of higher layer protocols (eg TCP), and control plane procedures (eg session setup) Independent system operation within various sized spectrum allocations ranging from 1.25 MHz to 20 MHz. Another requirement related to deployment for long-term development is these: To enable a smooth transition to technology.

Current and LTE UTRAN architecture
The architecture of the Universal Mobile Telecommunication System (UMTS) high-level release 99/4/5/6 is shown in FIG. 1 (Non-Patent Document 1 available from http: //www.3gpp.org—incorporated herein by reference) See-). A UMTS system is composed of a number of network elements, each having a defined function. Each network element is defined by its own function, but a similar physical realization of each network element is common, though not necessarily.

  The network elements are functionally grouped into a core network (CN) 101, a UMTS terrestrial radio access network (UTRAN) 102, and a user equipment (UE) 103. UTRAN 102 is responsible for handling all functions related to wireless communication, and CN 101 is responsible for routing calls and data connections to external networks. The interconnection between CN / UTRAN and UTRAN / UE is formed by open interfaces (lu and Uu, respectively). It should be noted that the UMTS system is modular and therefore can have several network elements of the same type.

  That is, here we discuss two different architectures, which are defined in terms of logical functional distribution to each network element. In an actual network deployment, each architecture can have a variety of physical realizations, meaning that two or more network elements can be combined into a single physical node.

  FIG. 2 shows a typical overview of a 3GPP LTE mobile communication network. The network consists of various network entities that are functionally grouped into a core network (CN), radio access network (RAN) and user equipment (UE). The RAN is responsible for handling all functions related to radio communications, including in particular scheduling of radio resources. The CN is responsible for routing calls and data connections to external networks.

  The LTE network is a “two-node architecture” composed of an access gateway (aGW) and a node B (also referred to as an extended node B, eNode B, or eNB). The aGW handles the CN function, i.e. the routing of calls and data connections to external networks, as well as the RAN function. Thus, aGW can be thought of as integrating some of the functions performed by SGSN and RNC in today's 3G networks with RAN functions such as header compression and encryption / integrity protection. Node B can handle functions such as radio resource control (RRC), partition / concatenation, resource scheduling and allocation, multiplexing and physical layer functions, for example.

  Mobile communication networks are usually modular and can therefore have several network elements of the same type. The interconnection of network elements is formed by an open interface. The UE is connectable to the Node B via a radio interface labeled Uu interface. Node B can have a connection to the aGW via a so-called S1 interface. Node Bs are interconnected via a so-called X2 interface.

  The integration of both 3GPP and non-3GPP can be processed via an aGW interface to an external packet data network (eg, the Internet).

  As already mentioned above, in the exemplary network architecture of FIG. 2, it is assumed that ownership of cell resources is handled at each Node B. Having cell resource ownership outside the aGW allows support for aGW pooling (for both CP / UP flows) and allows one Node B to connect to multiple aGWs for different terminals (As a result, avoid single point of failure).

UTRA Radio Interface Protocol Architecture An overview of UTRAN radio interface protocol architecture is shown in FIG. In general, UTRAN's radio interface protocol architecture implements layers 1 to 3 of the OSI protocol stack. Protocols terminated with UTRAN are also referred to as access layer protocols. In contrast to the access layer, all protocols that are not terminated in UTRAN are also commonly referred to as non-access layer protocols.

  The vertical division of each protocol into a user plane and a control plane is clearly shown in FIG. The radio resource control (RRC) protocol is a third layer protocol of the control plane that controls lower layer protocols of the UTRA radio interface (Uu).

  RRC control is now usually terminated at the UTRAN RNC, but other network elements discussed with respect to the currently considered LTE architecture, such as Node B, also terminate the RRC protocol in UTRAN. Has been taken into account. The RRC protocol for LTE (so-called E-RRC protocol) is terminated at the Node B. The RRC protocol is used for signaling control information for controlling access to radio resources of the radio interface leading to each UE. In addition, the RRC protocol may encapsulate and transmit non-access layer messages that are typically associated with control within the non-access layer.

  In the control plane, the RRC protocol relays control information to the second layer, the radio link control (RLC) protocol, via the SAE radio bearer for signaling through the service access point (SAP). In the user plane, non-access layer protocol entities can use SAE radio bearers to access layer 2 directly via SAP. Access may be made directly to the RLC or sequentially to a packet data convergence protocol that supplies its PDUs to the RLC protocol entity.

  RLC provides services to higher layers through its SAP. The RRC configuration defines how RLC processes packets, for example, whether RLC operates in transparent mode, response mode or non-response mode. Services provided by RRC or RDCP to higher layers in the control plane and user plane are also referred to as signaling SAE radio bearers and SAE radio bearers, respectively.

  The MAC / RLC layer then provides its services to the RLC layer using so-called logical channels. A logical channel basically defines what kind of data is transmitted. The physical layer provides its services to the MAC / RLC layer as a so-called transport channel. The transport channel defines how and with what characteristics the data received from the MAC layer is transmitted over the physical channel.

Configuration of (Broadcast) System Information In 3GPP terminology, (broadcast) system information is also named BCCH information. That is, it refers to information transmitted on the broadcast control channel (which is a logical channel) of the radio cell to which the UE is connected (active state) or attached (idle state). The structure of information on BCCH is shown in FIG. Generally, the system information includes a master information block (MIB) and several system information blocks (SIB). The MIB includes control information for each system information block. The control information associated with each SIB can have the following configuration. Each control information associated with an SIB is a location of the SIB on the transport channel where it is transmitted relative to a common timing reference (eg, a location in the time-frequency plane for OFDM radio access, ie, each The location within a particular resource block (assigned to SIB transmission) can be indicated. In addition, the SIB repetition period is also indicated. This repetition period indicates a period in which each SIB is transmitted. The control information may also include a timer value for a timer based update mechanism, or alternatively a value tag for update based on a tag of SIB information.

  The table below summarizes the classification and types of system information blocks in UMTS legacy systems as defined in Non-Patent Document 2 available at http: //www.3gpp.org—incorporated into this document by reference— Indicates. The classification of the system broadcast information into each SIB is based on the contents and the temporal variability shown in the right column of Table 1.

Long Term Development (LTE) Requirements According to Non-Patent Document 3 (obtained at http://www.3gpp.org and incorporated herein by reference), evolved UMTS Terrestrial Radio Access (E-UTRA) is It shall operate within a spectrum allocation of various sizes including 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz on both the uplink and downlink. In addition, E-UTRA shall be able to operate independently, i.e. it does not require other carriers available for signaling support from other systems.

  Non-Patent Document 3 also mainly aims to greatly reduce the latency of the control plane, which is one of the main purposes described above. This is the transition time between different operational states of the UE, ie from the camped state (eg UMTS Release 6 idle mode or LTE_idle state or mode) to the active state (eg UMTS Release 6 Cell_DCH state or It means that the time (excluding downlink paging delay and non-access layer signaling delay) until the user plane for the UE is established (LTE_active state or mode) is less than 100 ms. In general, a UE is said to be camped on a cell when it has finished the cell selection / reselection process and has selected a cell and is in LTE idle mode. When in this camped state, the UE monitors (in many cases) the paging information channel for transport channels configured to transmit system information. In the LTE_active state, a signaling SAE radio bearer is established for the exchange of control information, and the UE can monitor a transport channel configured to receive user plane information and transmit system information.

Spectrum configuration, system bandwidth and UE capabilities
As explained above, E-UTRA shall operate independently within each spectral configuration. The system bandwidth corresponding to various spectral arrangements would be 1.25, 2.5, 5.0, 10.0, 15.0 and 20.0 MHz. However, for each of these system bandwidth sizes, a UE with a certain bandwidth capability in active mode or idle mode (also referred to as LTE_active mode and LTE_idle mode in the case of LTE 3GPP systems) Several scenarios may be defined depending on the actual location in the frequency domain (UE camping). According to the current agreement in Phase II of LTE standardization, the bandwidth capability of the terminal should be at least 10 MHz. FIG. 5 assumes a system bandwidth size of 15 MHz divided into three equally sized subbands without losing the generality of the description, and the bandwidth capabilities unique to each terminal are 5, 10 and 15 MHz. A typical deployment scenario is assumed.

  According to the current decision of TSG RAN WG1 (see Non-Patent Document 4—obtained at http://www.3gpp.org and incorporated herein by reference), broadcast system information is system bandwidth Sent in the center of the. As shown in FIG. 6, if the LTE_active UE is located in the upper part or the lower part of the system bandwidth of the radio cell A, the UE is broadcast in the center part of the system bandwidth of the radio cell B. System information cannot be decrypted.

Mobility Management—Suspension Time In LTE, mobility within the same RAT (Radio Access Technology) of a terminal in an active state or mode is realized by a hard handover procedure. FIG. 7 shows the hard handover procedure at the level of the third layer message (E-RRC protocol message in LTE), in which the corresponding interruption time caused by the handover is shown. The interruption time during which the UE has no connectivity (ie, the time from detaching (separating) from the original cell and entering active mode in the target cell) is the broadcast control channel of the target enhanced Node B To obtain system information (SIB5, SIB7 and SIB17) from

  The system information can be acquired only after receiving the [E-RRC] handover instruction message. Since receiving the MIB containing scheduling information for each SIB in the destination cell is necessary to receive each SIB associated for system access and layer 3 connectivity establishment, the destination It is impossible for a UE attached to a cell to receive relevant system information (each SIB) before receiving the MIB. [E-RRC] If the MIB is sent shortly before receiving the handover indication, the UE will therefore be able to receive the MIB and subsequently receive each relevant SIB for system access. It is necessary to wait for almost all repetition cycles. This would result in an increase in interruption time of about 50 ms. This increase is significant considering the LTE requirement of control plane latency of less than 100 ms.

  Another problem is intra-RAT mobility for terminals in LTE_idle mode. Usually this mechanism is managed by a cell reselection procedure. Given the requirement to reduce control plane latency and the general service-based requirement to reduce downtime, E_RRC state machine LTE_active (original cell) → LTE_idle (original cell) → LTE_ It is important to minimize latency in the transition chain from idle (destination cell) to LTE_active (destination cell).

  Assuming that the first part of the transition chain involves cell reselection, this translates into reducing the interruption time of the cell reselection procedure shown in FIG. As with the hard handover, as in the case described above for the handover procedure, the system information can be acquired only after the reception of the [E-RRC] E-RRC connection release message. Thus, the same problem with control plane latency and its associated impact also exists in mobility management for UEs in LTE_Idle mode.

The UE cannot receive the system information on the BCCH from the neighboring cell before becoming attached to the target cell. Since each SIB required for system access in the target cell can be received only after the MIB of the target cell is decoded, the latency of the mobility procedure of the UE in the active or idle mode is the LTE system. Appears to be too high to achieve the desired break time of about 100 ms as defined for.
3GPP TS 25.401: "UTRAN Overall Description" 3GPP TS 25.331, "Radio Resource Control (RRC)", version 6.7.0, section 8.1.1 3GPP TR 25.913, “Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN)”, version 7.3.0 3GPP TR 25.814, “Physical Layer Aspects for Evolved UTRA”, version 1.4.1 3GPP RAN LTE ad hoc Tdoc R2-062016, “UL Timing Acquisition in LTE HO”

  The object of the present invention is to propose a mechanism that overcomes at least one of the problems outlined above. A more detailed object of the invention is to propose an improvement of the current mobility procedure so as to reduce the interruption time associated with the above procedure.

  One of the above objects is solved by the subject matter of the independent claims. Advantageous embodiments of the invention are the subject matter of the dependent claims.

  According to an aspect of the present invention, the attachment point of a mobile terminal in a radio access network is changed from one radio cell to another (eg, from an original radio cell to a destination radio cell). Or it is proposed to introduce a pointer (through the original cell—that is, transmitted in the cell in which the mobile terminal is currently) to a control message that informs the mobile terminal to change connectivity . This pointer in the control message thereby points to system information specific to the destination cell in the destination cell. In one more detailed example, the pointer in the control message points to the destination cell specific system information that is necessary for system access to the destination cell and / or to perform mobility procedures. Can do.

  In one embodiment, the pointer may indicate scheduling information of system information specific to the destination cell that is broadcast / transmitted in the destination cell. In another embodiment of the invention, the pointer points to system information in the destination cell that is required for system access to the destination cell and / or mobility procedures such as handover or cell reselection, for example. .

  Another aspect of the present invention (which can be advantageously combined with aspects that include pointers to control messages) increases the flexibility of transmitting system information. According to this, the cell system information is transmitted via a fixed rate transport channel and / or via a variable rate transport channel. Thus, the pointer in the control message sent to the mobile terminal in the original cell is, for example, scheduling information such as system information or the transport format of its individual segment and / or system information or its individual An indication can be given to map the segmentation to a fixed rate transport channel and / or a variable rate transport channel.

  According to one embodiment of the present invention, a method for notifying a mobile terminal about system information specific to a destination cell in a mobile communication system is provided. The mobile terminal can obtain an instruction to change the connectivity or its own attachment point from the original cell to the destination cell by a control message transmitted from the radio resource control entity of the original cell. This control message includes at least one pointer to system information specific to the destination cell in the destination cell.

  The target cell specific system information may comprise, for example, information related to establishing connectivity on the target cell's radio interface or information related to changing an attachment point to the target cell. .

  Using the at least one pointer included in the control information, the mobile terminal may be able to receive system information specific to the destination cell in the destination cell.

  In another exemplary embodiment of the present invention, the destination cell specific system information in the destination cell is mapped to a fixed rate transport channel or a variable rate transport channel. The pointer may thus indicate a mapping of the destination cell specific system information to a fixed rate transport channel and / or a variable rate transport channel in the destination cell.

  In yet another embodiment, the pointer may include a leading system frame number from which scheduling information comprising transmission format and timing for at least a portion of the destination cell specific system information is valid. The scheduling information may be a part of system information specific to the destination cell received by the mobile terminal, for example.

  Upon retransmission of a control message according to a radio resource control protocol, another embodiment of the present invention provides an update comprising a transmission format and timing for at least a portion of the updated system frame number or destination cell specific system information It is proposed that a protocol data unit specific to the medium access control protocol indicating the scheduled scheduling information is transmitted to the mobile terminal.

  Thereby, the control message may indicate, for example, a retransmission period or an updated system frame number that specifies the interval at which system information specific to the target cell is retransmitted within the target cell. Further, in another embodiment, the mobile terminal determines an updated system frame number based on the system frame number and the retransmission period.

  The fixed rate transport channel can be, for example, a broadcast transport channel having a fixed transport format, and the variable rate transport channel has a variable transport format. It can be a shared transport channel or a broadcast transport channel.

  Furthermore, in another embodiment of the present invention, the system information specific to the destination cell is transmitted in the form of at least one system information block. In this case, the pointer in the control message may indicate whether each system information block is mapped to a fixed-rate transport channel and / or a variable-rate transport channel in the destination cell.

  Furthermore, if the system information block is mapped to a variable rate transport channel, the pointer can further indicate, for example, the transmission format and timing of each system information block on the variable rate transport channel. . If the system information block is mapped to a fixed rate transport channel, the pointer can specify, for example, the location of each system information block on the fixed rate transport channel in the destination cell, A repetitive cycle in which each system information block is retransmitted can be selectively specified as needed.

  In another embodiment, control information related to a variable rate transport channel is transmitted to the mobile terminal on the control channel in the target cell. This control information may indicate the transmission format and timing of each system information block transmitted on the variable rate transport channel. Further, the control information may comprise an identification of a logical channel to transport channel mapping.

  In another embodiment of the invention, the pointer to destination cell specific system information is at least one variable rate transport channel onto which at least a portion of the destination cell specific system information is mapped. Contains information about the settings of

  According to yet another embodiment, the control message may comprise a part of the destination cell specific system information, eg, one or more system information blocks.

  In another embodiment, at least a portion of the destination cell specific system information is transmitted simultaneously on at least two different resource blocks of the radio interface of the mobile communication system. The portion may correspond to, for example, at least one system information block.

  In one embodiment of the present invention, the control message instructs the mobile terminal to attach to one of a plurality of possible neighboring cells.

  In another embodiment of the invention, the radio resource control entity that controls the original cell may receive at least one pointer from the radio resource control entity that controls the neighboring cell to neighboring cell-specific system information. it can. This at least one pointer may be received by the radio resource control entity of the original cell from the radio resource control protocol of the target cell, for example, via a frame protocol or application protocol message. In a variation of this embodiment, in the case of an LTE system, there is a direct interface between two radio resource control entities, such as an X2 interface between Node Bs that each provide a terminal with radio resource control functions including mobility management. Is provided.

  In yet another variation, if a neighboring cell is a destination cell for handover of the mobile terminal, or a cell that the mobile terminal may attach to when the neighboring cell performs cell selection or cell reselection, The pointer received from the adjacent radio resource control entity may be included in the control message transmitted to the mobile terminal in the original cell.

  According to another embodiment of the invention, the change of connectivity or attachment of the mobile terminal from the original cell to the destination cell is part of a handover procedure, a cell selection procedure or a cell reselection procedure.

  Further, in another embodiment, the destination cell specific system information related to the system information that dynamically changes in the destination cell is pointed to by the pointer in the control message, while the system information that does not change dynamically The system information specific to the destination cell concerned is included in the control message.

  In another embodiment of the invention, the destination cell specific system information related to the critical system information of the destination cell is pointed to by the pointer in the control message, while the destination cell related to the non-critical system information. Specific system information is not pointed to by the control message pointer and is not included in the control message. For example, important system information may be information necessary to perform a mobility procedure.

  Furthermore, important system information that the mobile terminal has to acquire in order to execute the hard handover procedure is, for example, information on the setting of the common physical channel in the destination cell and / or the setting of the shared physical channel in the destination cell. Information.

  In another example, important system information that the mobile terminal must obtain to perform cell selection or cell reselection procedures is information on cell selection parameters for the destination cell and / or uplink in the destination cell Information about interference.

  In one embodiment of the present invention, system information specific to the destination cell is periodically transmitted within the destination cell.

  In an embodiment of the present invention, the control message transmitted to the mobile terminal through the original cell may be, for example, a radio resource control protocol message.

  In another embodiment, the target cell specific system information is system information transmitted on the broadcast control logical channel of the target cell.

  Another embodiment of the present invention provides a radio resource control apparatus for notifying a mobile terminal served by the radio resource control apparatus about system information specific to a destination cell in a mobile communication system. In order to instruct the mobile terminal to change the connectivity or attachment point from the original cell served by the radio resource control apparatus to the destination cell by transmitting a control message to the mobile terminal Communication units. As described above, the control message may include at least one pointer to system information specific to the destination cell in the destination cell.

  In yet another embodiment, the communication unit may receive each pointer from at least one adjacent cell to adjacent cell specific system information. Further, at least one pointer received from a neighboring cell may be included in the control message.

  In one embodiment of the invention, the control message is a separate message sent to the mobile terminal.

  In yet another embodiment, the communication unit may transmit a pointer regarding system information specific to a cell controlled by the radio resource control device to at least one adjacent radio resource control device. According to this embodiment, the pointer regarding the system information specific to the cell controlled by the radio resource controller can be transmitted in at least one application protocol or frame protocol message.

  In another embodiment, the radio resource control apparatus performs a method for notifying a mobile terminal about system information specific to a destination cell according to one of the various embodiments described in this document. Means may further be included or may be adapted to carry out the method.

  Yet another embodiment of the present invention relates to a mobile terminal used in a mobile communication system. The mobile terminal includes, for example, a communication unit (such as a receiver and a transmitter) for receiving a control message instructing the mobile terminal to change connectivity or an attachment point from the original cell to the destination cell. The control message is received from the radio resource control device of the original cell, and the control message includes at least one pointer to system information specific to the destination cell. Further, the mobile terminal may be adapted to attach or connect to the destination cell using the pointer to the destination cell specific system information included in the control message.

  In another embodiment, the mobile terminal performs and participates in a method for notifying the mobile terminal about system information specific to the destination cell according to one of the various embodiments described in this document. Means may be further included, or may be adapted to perform and participate in the method.

  Furthermore, the present invention according to another embodiment provides a communication system comprising a radio resource control apparatus and a mobile terminal as described in this document.

  Further, in another embodiment, the radio resource control device is configured to notify the mobile terminal served by the radio resource control device in the mobile communication system about the system information specific to the destination cell when executed by the processor of the radio resource control device. It relates to a computer readable medium storing instructions for operating a resource controller. The radio resource control apparatus instructs the mobile terminal to change the connectivity or attachment point from the original cell served by the radio resource control apparatus to the destination cell by transmitting a control message to the mobile terminal. , The mobile terminal served by the radio resource control apparatus can be operated to notify the system information specific to the destination cell, and the control message is specific to the destination cell in the destination cell. Comprising at least one pointer to the system information.

  In yet another embodiment, the computer readable medium, when executed by the processor of the radio resource controller, is system information specific to the destination cell according to one of the various embodiments described in this document. Instructions for operating the radio resource control device to perform the steps of the method for notifying the mobile terminal about the are stored.

  Another embodiment of the present invention provides a control message instructing the mobile terminal to change connectivity or attachment points from the original cell to the destination cell when executed by a processor of the mobile terminal in the mobile communication system. The control message is received from the radio resource control device of the original cell, and the control message includes at least one pointer to system information specific to the destination cell, and the destination included in the control message It relates to a computer readable medium storing instructions for attaching or connecting to a destination cell using the pointer to cell specific system information.

  The computer readable medium according to yet another embodiment is a mobile terminal for system information specific to a destination cell according to one of the various embodiments described in this document when executed by a processor of the mobile terminal. A method for informing the mobile terminal is executed, and further instructions for operating the mobile terminal to participate in the method are stored.

  Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings and drawings. Similar or equivalent details in the figures are marked with the same reference numerals.

  As already outlined, one aspect of the present invention is to propose an improvement that minimizes the delay of existing hard handover or cell reselection procedures. According to this aspect, the connectivity or attachment point of the mobile terminal is changed from the original radio cell (controlled by the original base station) to the destination radio cell (controlled by the destination base station). In order to give instructions to the mobile terminal, it is proposed to include a pointer in the control message sent to the mobile terminal.

  According to an embodiment of the present invention, the control message is transmitted from the original base station to the mobile terminal through the original radio cell. It should be noted that in this embodiment, it is assumed for exemplary purposes that the base station is responsible for managing the mobility of mobile terminals in that cell. More broadly, it may be assumed that the control message is transmitted from a radio resource control entity that handles mobility functions in the original cell and terminates in the original Node B. The control message may be, for example, a cell reselection command (eg, [E-RRC] connection release message) or a handover command message (eg, [E-RRC] handover instruction message).

  The pointer included in the control message indicates to the mobile terminal system information specific to the destination cell in the destination cell. In the case of cell reselection, one or a plurality of pointers included in a control message indicating system information specific to a destination cell in each destination cell among a plurality of possible destination cells to the mobile terminal There is a possibility. These possible destination cells are usually at least one of several radio cells adjacent to the original cell. By pointing to the mobile terminal system information specific to the target cell in the target cell (possibly), the mobile terminal can attach to the target cell and simultaneously receive cell-specific system information in the target cell Thus, there is no need to receive a pointer (or a plurality of pointers) to system information specific to the destination cell through the destination cell.

  The pointer is a collection of control information (e.g., transport channel used) that is applicable to at least a portion of system information specific to the destination cell (e.g., at least one SIB). The location of the upper SIB, i.e. the position in the time-frequency plane relative to the common timing reference, the repetition period, the timer value and the value tag) can be included like a module. In addition to containing a subset of the information transmitted in the MIB of the target cell, the pointer is a specific value (eg, system frame) from which the information contained in the pointer is valid. Number).

  In one embodiment, the cell-specific system information in the destination cell is the system information for establishing connectivity on the radio interface of the destination cell or information related to changing the attachment point to the destination cell. including. For example, the related system information may be information regarding the setting of a common physical channel in the destination cell and / or information regarding the setting of a variable speed physical channel or a shared physical channel used for transmission of system information in the destination cell. . Optionally, the related system information may further include information regarding uplink interference in the target cell.

  Alternatively, the related system information may be information on cell reselection parameters in the destination cell and / or information on interference in the destination cell. Optionally in this alternative, the related system information may further include information related to the setting of a common physical channel in the destination cell.

  In a more specific example, the related system information may be information described below. Depending on whether a handover procedure or a cell reselection procedure is performed, the different combinations of information outlined below are considered related to establishing connectivity on the radio interface of the target cell or attachment Note that the information is considered related to changing the point to the destination cell. Each of the following system information portions may be included in an individual system information block.

  One important part of the system information is the cell selection parameter. These parameters that may be particularly relevant to cell reselection include cell identification, cell selection and reselection information (eg, cell selection and reselection quality measurement), access of a mobile cell that a mobile terminal may be able to attach It may include restriction information and the like. Applying the classification shown in Table 1 above, this information can be included in the system information block SIB3, for example.

  Another relevant part of the system information for performing the mobility procedure is setting up a common physical channel of the potential destination cell. This information may be particularly relevant in the case of handover, but may also be useful in the case of cell reselection. Common physical channel settings may include, for example, information about paging channel settings, which are allocated resource blocks in the time-frequency plane, modulation and coding scheme used for the paging channel. And further comprising setting up a RACH (Random Access Channel) channel in the time-frequency plane (eg, allocation of access slots). Applying the classification shown in Table 1 above, this information can be included in the system information block SIB5, for example.

  Yet another relevant part of the system information may be, for example, information on cell uplink interference that may be important during cell reselection. This information can be significant in that additional delays due to backoff can be avoided in random access procedures. Uplink interference information may comprise uplink interference information for each random access channel defined in the time-frequency plane. Applying the classification shown in Table 1 above, this information can be included in the system information block SIB7, for example.

  Another relevant part of the system information may be information regarding the setting of the shared physical channel in connected mode. Of particular importance is the above information in the uplink and downlink SCH (shared channel) and the associated L1 / L2 (layer 1 / layer 2) control channel. The accompanying L1 / L2 control channel typically carries scheduling information for downlink data transmission, scheduling grant for uplink data transmission, and ACK / NACK for uplink data transmission. obtain. More specifically, the configuration of each channel may comprise the allocation of resource blocks in the time-frequency plane and the modulation and coding scheme used. Applying the classification shown in Table 1 above, this information can be included in the system information block SIB17, for example.

  In one embodiment of the present invention, individual types of system information may be put into types in system information blocks. Thus, if the system information specific to the target cell pointed to in the control message is communicated separately in individual system information blocks, the control message may include a pointer that points to each of the system information blocks, for example. Or the pointer may comprise information related to all system information blocks.

  In another embodiment, the target cell specific system information is broadcast control logical channel data such as, for example, BCCH in 3GPP based systems and will be broadcast to all terminals in each cell. The target cell specific system information may therefore be one or more system information blocks of the target cell's broadcast control logical channel. In one embodiment of the present invention, system information blocks can be mapped to a single broadcast (transport) channel for transmission within a wireless cell. In another embodiment, the system information block may be mapped to multiple transport channels, eg, a fixed rate transport channel and / or a variable rate transport channel. A fixed rate transport channel may also be referred to as a fixed rate broadcast channel or primary broadcast channel, while a variable rate transport channel is a variable rate broadcast channel or secondary broadcast channel. Sometimes referred to as a channel. In other words, a fixed rate transport channel can therefore be considered a “fixed rate part” of a broadcast logical channel, while a variable rate transport channel is a “variable rate part of a broadcast logical channel. Can also be considered.

  As will be described in more detail later, according to one embodiment of the present invention, individual system information blocks (part of system information specific to the destination cell) can be divided into fixed-rate transport channels and variable-rate transport channels. It can be mapped to either or both of the transport channels. Furthermore, in another embodiment, one or more system information blocks (part of system information specific to the destination cell) can be transmitted simultaneously on different radio resources of the destination cell.

  The mapping of system information blocks to variable rate and / or fixed rate transport channels can be advantageous in that the acquisition of this information by the mobile terminal can be optimized in terms of terminal processing time and power consumption. Other benefits also include improved time for the mobile terminal to read broadcast system information for all sizes of independent spectrum allocation, and operator flexibility in setting up a transport channel for broadcast. And increased scheduling efficiency of system information that can arise from mapping system information to variable rate transport channels.

  Generally speaking, the pointer in the control message may include information regarding the scheduling of at least one system information block (or a portion of the system information specific to the destination cell). If the system information block (or part of the system information specific to the destination cell) is mapped to a variable rate transport channel, the pointer is for example the transmission format (eg position in the time-frequency plane, ie allocated). Resource block itself, modulation and coding scheme used, DTX-discontinuous transmission is also possible) and variable rate transport channel for each system information block (or part of system information specific to the destination cell) You can indicate the timing above. If a system information block (or a portion of the system information specific to the destination cell) is mapped to a fixed rate transport channel, the pointer is the position of each system information block on the fixed rate transport channel (eg, The position in the time-frequency plane, ie the allocated resource block itself) and optionally the timing at which each system information block is transmitted relative to a common timing reference under the destination cell. Can be specified. Finally, in both cases, the pointer may contain a leading SFN (system frame number that is a common unit of cell timing reference) indicating that the information is valid therefrom. Further, if it is foreseen that the system information block (or destination cell specific system information) will be mapped to more than one transport channel, the pointer will be in each system information block (or destination cell specific). A portion of system information) may also include an indication of the transport channel to which it is mapped.

  It should be noted that transmission of relevant system information on the variable rate portion of the broadcast channel may allow for a more flexible implementation of scheduling related system information blocks in the destination cell. However, the present invention is not limited to only transmitting relevant system information on the variable rate portion of the destination cell's broadcast channel (such as BCH). Implementations of the invention in which only a fixed rate portion of the broadcast channel is used can also be foreseen.

  Furthermore, transmissions on variable speed transport channels can also be described as “variable speed transmissions” or “flexible speed transmissions” (in response, variable speed transport channels are flexible It can also be written as a speed transport channel).

  According to one exemplary embodiment related to the implementation of the present invention in a 3GPP-based communication system, the variable rate transmission of system information can be performed using a DL-SCH transport channel or BCH with a variable transport format. This can be achieved by transmission on the transport channel. Similarly, “fixed rate transmission” can be realized, for example, by transmission on a BCH transport channel having a fixed transport format for system information.

  Another aspect of the invention relates to communicating pointers to cell specific system information between radio resource control entities in a communication system. This can be advantageous, for example, if a fixed configuration for transmission of system information within the cell (each known to neighboring radio resource control entities) is not used. According to this aspect, pointers (e.g., mapping of scheduling information and / or related system information) that typically point to cell-specific system information in the cell of the entity issuing the report to each other's base stations in neighboring cells. Can notify the other base station. The signaling of the information (pointer or pointers) may be based on a request-response mechanism, for example, or corresponds to, for example, a change in mapping of system information or a change in transmission format and / or timing of system information And may be initiated by a radio resource control entity. Since there may be multiple mobility procedures defined in the system, such as handover and cell reselection, the radio resource control entity may signal each pointer to the system information associated with each mobility procedure (of course, the same system information If it is related to multiple mobility procedures, only one pointer may be signaled). In an exemplary embodiment of the invention related to the implementation of this aspect in a 3GPP based communication network, the original Node B can schedule SIBs associated with one or more mobility procedures from one or more neighboring Node Bs. Can be notified. As described above, SIB scheduling can use a fixed transport format and / or a fixed mapping to a transport channel can be used. This can be set as part of the overall operation and maintenance (O & M), for example. Alternatively, the scheduling and / or mapping may be dynamic and exchanged by being signaled via an X2 interface (see FIG. 2) between Node Bs using a frame or application protocol. It is. Finally, in the case of hard handover, the desired information may be incorporated into a handover response message transmitted from the original Node B to the destination Node B, for example.

  Before further elaborating the inventive concept according to various exemplary embodiments below, in accordance with one exemplary embodiment of the present invention (eg, broadcast control channel (BCCH) —transmitted on a logical channel). The structure of the system information will be outlined in more detail with reference to FIG. The information structure can take a tree-like structure. A so-called master information block (MIB) forms the root of a tree structure, and so-called each system information block (SIB) is its branch. MIB information may be transmitted less frequently than each SIB carrying broadcast system information. Information in the MIB may not need to be read by individual terminals each time MIB information is transmitted. For exemplary purposes, in this embodiment it can be assumed that system information is mapped to a single broadcast transport channel.

  For example, each of the partitions in the MIB can be reserved for information regarding each system information block. The control information related to each SIB included in the secured section can have the following configuration. Each control information related to the SIB, contained in the MIB pointer, can be found on each broadcast transport channel (fixed rate or variable rate transport channel) where each SIB is transmitted relative to a common timing reference. It may include the location of the SIB. Further, the SIB repetition period may be indicated. This repetition period indicates a period in which each SIB is transmitted. The control information may further include a timer value for a timer-based update mechanism, or alternatively, a value tag for an update mechanism based on a tag of SIB information.

  Using this typical configuration of MIBs in the destination cell and SIB logical channel to transport channel mapping, the configuration of a typical broadcast transport channel can be as shown in FIG. . When a mobile terminal performs a mobility procedure to attach or connect to a destination cell having this channel configuration, a control message notifying the mobile terminal to attach or connect to this destination cell is the mobility procedure. May comprise a pointer having control information indicating the relative timing of the transport format and associated system information. For example, if the related system information is included in SIB5 and SIB17 for the handover procedure, the pointer of the control message points the above SIB in the destination cell to the mobile terminal, so that (for example, Even if the mobile terminal does not receive the MIB first (as in the case where the mobile terminal attaches to the destination cell in response to the control message after the MIB is broadcast in the destination cell), the mobile terminal attaches to the destination cell at the same time as described above. Can be received.

  Next, another exemplary embodiment of the present invention will be described in which system information is mapped to one or both of a fixed rate transport channel and / or a variable rate transport channel. FIG. 10 illustrates a pointer to original cell-specific system information according to an exemplary embodiment of the present invention when system information is mapped to a fixed-rate transport channel and a variable-rate transport channel. The concept of inclusion in a control message transmitted over a cell is shown. For illustrative purposes, it can be assumed in this embodiment that the classification of broadcast system information presented in Table 1 into each system information block (SIB) applies. The contents of Table 1 above should only be considered as one possible example of the contents and classification of broadcast system information. Also, the classification of the frequency at which different parts of the system information are broadcast and its classification into different SIBs is intended to serve only for illustrative purposes and is not intended to limit the invention to this example. Not in. In the current development and improvement of existing mobile communication systems, it is recognized that the content, format, transmission period, etc. may change.

  Further, it can also be assumed for exemplary purposes only that the system information is mapped to fixed rate and / or variable rate transport channels in the target cell. On the fixed rate transport channel, the MIB is transmitted periodically, and the MIB contains control information identifying the mapping of each SIB to a fixed rate transport channel and / or a variable rate transport channel; As well as the transmission format and / or timing (if not fixed or preset) of each SIB. For illustrative purposes, a variable rate transport channel can be assumed to use a predetermined bandwidth of the total system bandwidth in the frequency domain. As illustrated in FIG. 10, this channel bandwidth can be divided into a plurality of subbands or subcarriers in the frequency domain. In the time domain, the radio interface resources of the variable rate transport channel can be divided into individual subframes. Each subframe can be assigned a system frame number (SFN) that indicates the relative position of the subframe in the time domain.

  The subbands or subcarriers in the frequency domain and the subframes in the time domain form a resource block that can be the smallest unit of radio interface resources that can be allocated to a user. Of course, the definition of the resource block is flexible, e.g. the resource block can span one or more subbands / subcarriers in the frequency domain and / or one or more subframes in the time domain. . Further, it can be assumed for exemplary purposes that the length of the transmission time interval (TTI) is equal to the length of one subframe in the time domain—of course, the TTI may alternatively span multiple subframes.

  As described above, in the conventional system, a mobile terminal attached to a new radio cell (destination cell) obtains mapping and transport format in the destination cell and / or timing of each SIB therefrom. In addition, it was necessary to first receive the MIB on a fixed rate transport channel. Only after obtaining this control information, the mobile terminal can receive an SIB including an associated SIB for performing a mobility procedure such as handover or cell reselection.

  If a control message instructing to attach / connect to the destination cell is received at a time instance (eg, 0) after the MIB is transmitted in the destination cell, the association for performing the mobility procedure The mobile terminal had to wait for the next MIB before it could receive the SIB. According to this embodiment of the invention, the control message comprises pointers to the associated SIBs—in this example SIB5 and SIB17 for performing the mobility procedure. Even if the MIB is missed in the destination cell, the above pointer in the control message gives the mobile terminal information on the mapping, timing and transport format of SIB5 and SIB17 in the destination cell. Even if the next MIB is not received, the mobile terminal can receive these SIBs when attached to the destination cell, and can continue the mobility procedure.

  Next, two exemplary mobility procedures, a hard handover procedure and a cell reselection procedure according to an exemplary embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 shows the hard handover procedure already described above. Improvements to the hard handover procedure according to one embodiment of the invention are described below. For exemplary purposes, it is assumed that Node B operates as a radio resource control entity in each cell. Initially, the UE is connected to the Node B in the current radio cell (original cell) and exchanges user plane data with the original Node B. In 3GPP based systems, it is active while receiving user plane data. The UE can, for example, periodically provide channel quality measurements to the original Node B, and this measurement information can be used to determine whether the UE needs to be handed over to another cell (destination cell). Node B. When the original Node B decides to hand over the UE to the destination Node B, the original Node B sends a handover request to the destination Node B, and the destination Node B responds to the UE in response to this request. Can perform admission authorization control. This request may include, for example, a context transfer of service and system information related to the UE so that the target Node B can set the resources accordingly. If the UE is allowed to enter to connect to the destination Node B, the destination Node B is in preparation that the destination Node B is preparing to connect the UE to the destination cell. It responds with a handover response informing the Node B. In this exemplary embodiment, the handover response message sent by the target Node B is the destination cell-specific system information and / or movement in the target cell related to the UE performing the handover procedure. It may contain pointers to system information specific to the destination cell. Further, for example, when the original cell and the destination cell are not synchronized, the handover response transmitted by the destination Node B may also include synchronization information that can be provided to the UE in the handover instruction. This synchronization information may be, for example, the system frame number (SFN) in the destination cell at the head of the information included in the pointer that will be included in the individual message. Therefore, after acquiring the SFN from the broadcast channel of the movement destination cell, the UE can know whether or not the information included in the pointer of the original cell is applicable.

  In response to receiving the handover response message from the destination Node B, the original Node B transmits a handover instruction to the UE. This handover indication instructs the UE to discard the user plane in the original cell and establish the user plane in the target cell (ie, enter the active state in the target cell). This is an individual control message. In 3GPP based systems, the UE continues to be active during the handover procedure. In order to expedite the establishment of the user plane in the destination cell, the handover instruction is used to attach (to attach to the destination cell) and the movement associated with establishing the user plane in the destination cell. A pointer may be included that points the UE to system information specific to the destination cell.

  Applying the typical classification shown in Table 1, this related information for the destination cell may be, for example, SIB5, SIB7 and SIB17. Since the UE has already received the pointer to the related system information, the UE can acquire SIB5, SIB7 and SIB17 of the broadcast control logical channel of the destination cell when attaching to the destination cell. As described above, in order to be able to receive SIB5, SIB7, and SIB17 in the destination cell, the UE does not need to receive the MIB first. Once the related system information is obtained, the UE can activate the user plane and start exchanging user plane data when a handover complete message is sent to the target Node B.

  FIG. 8 shows a cell reselection procedure. As with the hard handover case, the improvement of this procedure according to an exemplary embodiment of the invention will now be described. It is assumed for exemplary purposes that the Node B operates as a radio resource control entity in each cell. In general, the cell reselection procedure is performed by a UE in idle mode. In the example shown in FIG. 8, it is assumed for exemplary purposes that the UE is initially in active mode and transmits and receives user plane data in the original cell. In addition, the UE can provide traffic volume measurements to the original Node B, and this measurement information allows the original Node B to determine whether to maintain a connection to the UE and is evaluated at the original Node B. . If the connection is not maintained and a handover is performed instead, the connection release message allows the original Node B to release the connection to the UE, so that the UE enters idle mode. By this message, the original Node B delegates the UE mobility control to the UE. In one exemplary embodiment of the present invention, the connection release message may be a destination cell specific system information in a potential destination cell that is relevant for the UE to perform cell reselection and And / or pointers to possible destination cell specific system information. In general, a possible destination cell is a cell adjacent to the original cell.

  Upon receiving the connection release, the UE performs cell reselection to select a radio cell to connect to. Since the related system information of the selected destination cell and / or a pointer to the related system information are known to the UE, the UE can start reading the system information in the destination cell when it is attached. Further assume that the UE (in idle mode) is paged in the destination cell, or (as shown in FIG. 8) become active, i.e. make a decision to establish a user plane connection. Then, the UE and the destination node B establish a user plane connection by exchanging connection request, connection setting, and connection completion messages.

  FIG. 11 shows another exemplary embodiment of the present invention where system information is mapped to fixed rate and variable rate transport channels and layer 1 out-of-band identification is used. The concept of including the pointer to the system information peculiar to a movement destination cell in the control message transmitted via an original cell is shown.

  In FIG. 11, the system information in the destination cell and the control signaling related thereto are divided into three types: a fixed-rate transport channel, a variable-rate transport channel, and a physical control channel associated with the variable-rate transport channel. It is shown that it is mapped to a different channel. The control channel is associated with the variable rate transport channel in a manner that includes control information describing the transmission format and timing of system information on the variable rate transport channel.

  Furthermore, when performing the mobility procedure and attaching to the destination cell, the mobile terminal (or logically, mapping from the logical channel to the transport channel) that should receive system information in the destination cell is: It can be specified by each first layer out-band identification. Thus, the mapping from logical channels to transport channels is indicated on the associated physical control channel (eg, SCSCH).

  In the destination cell, for example, on the broadcast control logical channel (eg, BCCH in UMTS), the system information provided is mapped to the variable rate and fixed rate transport channels of FIG. .

  The master control block (MIB) is transmitted periodically (MIB repetition period) on a fixed rate transport channel. For example, the MIB may be transmitted after a predetermined length of time, such as a predetermined number of transmission time intervals (TTIs). Further, assuming a fixed rate and flexible rate channel configuration similar to that shown in FIG. 10, a subframe may have one or more system information blocks (SIBs). One SIB has a portion of system broadcast information to be transmitted. For example, each SIB may contain a predetermined or configurable set of certain types of information illustrated in Table 1.

  The MIB used in the exemplary embodiment shown in FIG. 11 is shown in more detail in FIG. FIG. 12 is a mapping of system information blocks to fixed rate transport channels and variable rate transport channels during layer 1 out-band signaling as shown in FIG. 11 according to an embodiment of the present invention. An exemplary format of an MIB including a pointer that points to is shown. This pointer of the MIB can also be included in a control message sent to the mobile terminal in the original cell to point to system information in the target cell. In the case of layer 1 out-of-band signaling, it can be assumed that the mobile terminal reads the associated physical control channel in the destination cell, including scheduling information on the variable rate transport channel in the destination cell. . Therefore, the pointer may also contain information on the setting of the accompanying physical control channel in the destination cell. The structure of the system broadcast information according to this embodiment of the present invention is a tree-like structure as outlined above. The MIB contains different parts of the control information, each of these parts being associated with each SIB. Similarly, when a control message transmitted to the mobile terminal through the original cell indicates an individual SIB such as SIB5 in the mobile cell, the configuration and contents of the control information are within the MIB of the target cell. It can be equivalent to that used.

  The control information in the pointer in the MIB or in the control message related to the SIB mapped for transmission to the fixed-rate transport channel in the destination cell can take the following configuration. Each control information (pointer to SIB # n) associated with a SIB indicates the position of that SIB on a fixed rate transport channel where the SIB is transmitted relative to a common timing reference. For each cell, a common timing reference is given by SFN and is assumed for exemplary purposes. Since the SNF numbering may be different between neighboring cells, the SNF of the destination cell can be transmitted in the control message so as to obtain information of the SFN for which the scheduling information is valid based on the SNF numbering. Furthermore, the SIB repetition period indicating the period in which each SIB is transmitted may be indicated in the MIB or control message pointer.

  The control information of the pointer related to the system information mapped to the variable rate transport channel may have a different configuration from the control information related to the system information mapped to the fixed rate transport channel. According to an exemplary embodiment, the control information for SIB 17 in the MIB pointer or control message pointer comprises an indication of the variable rate transport channel on which SIB 17 is transmitted. This indication is indicated in FIG. 11 by a dotted arrow pointing from the MIB to the variable rate transport channel.

  As described above, the first layer out-of-band identification is used to indicate to the mobile terminal that receives the logical channel to transport channel mapping. For this purpose, an identification of the mapping is transmitted on the associated control channel (see “ID”). This identification can use, for example, the default or configured identifier of the logical channel to which each transport channel is to be mapped at the receiver. These identifiers can be transmitted in the MIB. The identifier used may be a default value or may be set by the system.

  The control channel associated with the variable rate transport channel comprises control information indicating the scheduling of SIBs on the variable rate transport channel. This control channel can also be indicated by a pointer included in the control message. For each SIB, the control information can at least indicate the temporal position of the SIB mapped to the shared channel on that channel. In another embodiment of the present invention, the control information on the associated control channel is scheduling information and may include information regarding batch allocation, data modulation and transport block size.

  Returning to the transmission of broadcast system information in a UMTS system for exemplary purposes only, the transmission of Layer 1 out-of-band identification and scheduling information is limited to variable rate transport channels, and fixed rate transport. The scheduling information of the system information block conveyed over the channel is transmitted in the master information block of the fixed rate transport channel, i.e. in the second layer transport block. The fixed rate transport channel setting can be, for example, semi-fixed, while the shared downlink transport channel setting can be semi-fixed or dynamic. The flexibility of dynamic configuration of variable rate transport channels in this embodiment of the present invention can be advantageous from a radio resource utilization point of view because it can efficiently support rapid scheduling of broadcast system information.

  In an exemplary embodiment of the invention, the variable rate transport channel may be a shared downlink channel (SDCH) of a UMTS system, while a fixed rate transport channel is broadcast. -It can be a channel (BCH) and the control channel associated with the SDCH can be a shared control signaling channel (SCSCH).

  FIG. 13 illustrates another exemplary embodiment of the present invention where system information is mapped to fixed rate and variable rate transport channels and layer 2 in-band identification is used. The concept of including the pointer to the system information peculiar to a movement destination cell in the control message transmitted via the original cell is shown.

  In the exemplary embodiment shown in FIG. 13, a variable rate transport channel is used that does not require an associated (physical) control channel for identification. Similar to the embodiment of the present invention described with reference to FIGS. 11 and 12, in the embodiment shown in FIG. 13, system information is mapped to fixed rate and variable rate transport channels. Is done. An identifier (“ID”) indicating mapping from a logical channel to a transport channel, semi-fixed setting information (timing and transmission format) of a shared channel (eg, SDCH), and an accompanying physical control channel (eg, SCSCH) ) Setting is transmitted in-band. This means that two parts of information are transmitted in the second layer. For example, the identification (“ID”) may be provided in the header of the variable rate transport channel layer 2 packet, and the configuration information for the variable rate transport channel is in the MIB. Can be provided. Similarly, the control message pointer may include variable rate transport channel configuration information provided in the MIB of the target cell when pointing to the SIB on the variable rate channel.

  The identifier ID may be a default identifier, as described above, or may be set / assigned through a fixed rate transport channel MIB. FIG. 14 shows a typical format of the master information block used for mapping the system information block in FIG. More specifically, FIG. 14 illustrates when layer 2 in-band signaling is used to transmit scheduling information on a flexible broadcast channel, as illustrated in FIG. 13 according to one embodiment of the invention. Figure 2 illustrates an exemplary format of an MIB including pointers that point to mapping system information blocks to fixed rate and variable rate transport channels. This pointer of the MIB can also be included in a control message sent to the mobile terminal in the original cell to point to system information in the target cell. The structure of the control information related to the SIB mapped to the fixed-rate transport channel is the same as that in the MIB shown in FIG. The SIB MIB control information mapped to the variable rate transport channel may further include an indication of the variable rate transport channel to which each SIB is mapped. Similarly, the control message pointer also includes an indication of the mapping of the relevant SIB (s) in the destination cell.

  According to one exemplary embodiment, system information may be categorized as presented in Table 1 and in the Background section. In addition, a tree-like configuration of broadcast system information using MIB and SIB as described in the background section is also assumed for exemplary purposes.

Assuming for example purposes the case of LTE UMTS system and hard handover, the control message is an [E-RRC] handover indication message sent from the Node B controlling the original cell (original Node B) to the UE. It can be. Therefore, the original Node B can include the following information in the [E-RRC] handover indication message.
-The head system frame number (SFN) of the destination Node B from which each scheduling information is valid, and
-A portion of the MIB containing the scheduling information of SIB5 and SIB17 (and optionally SIB7) that is valid in the radio cell controlled by the destination extended Node B (eg, the aforementioned "pointer")

  In this example, it should be noted that the information of SIB5 and SIB17 can be regarded as related to establishment of a wireless connection to the destination cell.

Assuming for example purposes the case of LTE UMTS system and cell reselection, the [E-RRC] RRC connection release message (an example of a control message) may include the following information:
-SFN of each extended Node B that controls the candidate destination cell (several cells) from which each part of the scheduling information is valid
-A portion of the MIB containing the scheduling information of SIB3 and SIB7 (and optionally SIB5) that is valid for each extended Node B in the candidate destination cell list (eg, the "pointer" described above)

  In this example related to the cell reselection procedure, it can be considered that the information of SIB3 and SIB7 is related to the attachment of the UE to the destination cell.

  When the related SIB information is included in the individual RRC message by including a pointer in each of the above two individual control messages (here, the RRC layer control message) (in this case, as a result, the individual RRC message has a size of 1 kilobyte). The signaling load for communicating the relevant SIB information to the UE prior to handover or cell reselection may be reduced by about 100 bytes per message.

Another embodiment of the invention relates to increasing the reliability of transmission of related or critical SIBs mapped to variable rate transport channels in the destination cell. FIG. 15 illustrates an exemplary mapping of system information to fixed rate and variable rate channels in a target cell according to another embodiment of the present invention. Assuming that link adaptation techniques (such as adaptive modulation and coding (AMC) and / or power control) are applied to data transmission on a variable rate channel, the reliability of the data transmission depends on the mobile terminal receiving the data. It may change depending on the geometric position. For example, if a mobile terminal is located near a cell boundary, or moves at high speed within a cell, the mobile terminal may experience channel quality degradation (ie, in a low geometric location). As a result, the overall frame error rate is likely to increase. In such a scenario, the mobile terminal cannot successfully decode the relevant (or critical) system information (eg, SIB7 and SIB17 in the case of handover) and the relevant on the variable rate transport channel. The mobile terminal will have to wait for the next transmission after the (or important) system information repetition period T _rep, and as a result, the mobility procedure interruption time may increase.

  To avoid this problem, it may be foreseen to transmit relevant (or critical) SIBs mapped to variable rate channels in multiple resource blocks at a certain time instance (subframe or TTI) ( For example, the same SIB may be transmitted in more than one resource block in a subframe). For example, in FIG. 15, SIB 17 is mapped to a variable rate transport channel and transmitted in two resource blocks at a time instance. Similarly, it can also be foreseen to repeat relevant system information in successive subframes of a variable rate transport channel. In response, a pointer in the control message pointing to the relevant system information in the target cell can point to a separate resource block where the relevant SIB is repeated / transmitted.

  In another embodiment, the destination cell-specific control message is sent to the mobile terminal in order to trigger an attachment point change to the destination cell or to change connectivity to the destination cell. It can be further foreseen to include a portion of the system information (eg, individual SIB). FIG. 16 shows the setting of the control message according to an embodiment of the present invention, which includes a part of the system information specific to the destination cell in the control message itself and points to the other part of the system information specific to the destination cell by a pointer. Show. In the example shown in FIG. 16, the system information of the SIB5 of the destination cell is included in the control message, and the pointer in the control message is mapped to the transport channel (for example) of the variable speed. SIB7 and SIB17.

  According to another exemplary embodiment, the associated SIB in the individual control message instructing the received mobile terminal to change or connect to the mobile cell's attachment point to the target cell. May not be enough resources in the original cell to transmit. In this case, the related SIBs can be further classified into dynamic SIBs (the contents of which are frequently changed) and non-dynamic SIBs (the contents of which are not frequently changed). Also in this exemplary embodiment of the present invention, transmission in the control message of the individual associated SIB (ie, part of the system information) of the target cell may be foreseen. In this embodiment, the non-dynamic SIB of the target cell can be transmitted in a control message without losing system information. The dynamic SIB of the target cell may be pointed to by a pointer in the control message or may be included in the control message. Accordingly, as described above, the resource control entities of adjacent cells communicate with each other by signaling an associated SIB to an adjacent radio resource control entity, or a pointer to an associated SIB in its own cell. By providing the entity, related system information is exchanged. Recognizing the relevant system information in the target cell and / or the location and mapping of the information, the original radio resource control entity performs cell reselection or performs a handover to an adjacent cell (destination cell) Providing the mobile terminal with a pointer to the relevant system information in the destination cell, or (if part of) relevant system information-if this is included in the cell connection release command or handover indication-directly You can also.

  Assuming the SIB categories shown in Table 1 for exemplary purposes and assuming that the mobile terminal performs a hard handover procedure, the dynamic SIBs of the target cells are SIB7 and SIB17, while non-moving The target SIB is SIB5. For the cell selection (reselection) procedure, the dynamic SIB can be SIB7 and the non-dynamic SIB can be SIB3 and SIB5.

  To generally classify information by temporal variability (ie, dynamic or non-dynamic), one can consider rates f1 and f2 (f1 <f2) that indicate the frequency of variation of the information. For example, if the fluctuation rate f of a certain information (SIB) is in the relationship of f1 and f <= f1, this information (SIB) can be classified as non-dynamic because it has low temporal variability. Similarly, if the fluctuation rate f of information is in the relationship of f1 and f> f1, it can be said that the information has high temporal variability, that is, dynamic.

  For a large group of mobile terminals, it may be desirable to further reduce the signaling load. Another embodiment of the present invention is that SIBs that are critical to the mobility procedure (these are SIBs that must be acquired by the terminal to perform the mobility procedure) and SIBs that are not critical (they perform the mobility procedure) It is proposed to further reduce the signaling load in the original cell by defining the SIB that may not be obtained by the terminal. While one SIB may be considered as related to establishing connectivity on the destination cell's radio interface or as information related to changing the attachment point to the destination cell, the same SIB may be considered as the destination cell. It should be noted that it may not be important for establishing connectivity on the cell's radio interface or as information relevant to changing the attachment point to the destination cell.

  For example, assuming the system information categorization shown in Table 1 here again for illustrative purposes and considering the hard handover procedure, the important SIBs are SIB5 and SIB17, or more generally speaking, common physical It may be part of the system information of the destination cell, including information on channel settings and settings for shared physical channels in connected mode. This information may be needed to establish a connection to the destination cell, i.e., to re-enter active mode within the destination cell and initiate user plane data transfer. However, an associated SIB that seems not important for hard handover is that the destination Node B that controls the destination cell will send a timing adjustment to the original Node B in the handover response message (see FIG. 7). In contrast, uplink interference (ie, SIB7 in Table 1).

  Critical system information or SIB can be defined, for example, as a portion of system information or SIB that must be obtained by a mobile terminal to perform a mobility procedure. According to one embodiment, critical system information or SIB (s) can be pointed to and / or included in the control message, as described above. In contrast to critical system information / SIB, non-critical system information may be a portion of system information or SIB that may not be obtained by a terminal to perform a mobility procedure.

  In a hard handover procedure, the unimportant SIB may be system information (eg, SIB7) regarding uplink interference if the target Node B sends a timing adjustment to the serving Node B in a handover response message. The important SIB can be, for example, system information (for example, SIB5) regarding the setting of the common physical channel and system information (for example, SIB17) regarding the setting of the shared physical channel in the connection mode.

  After hard handover, asynchronous random access can be used by the Node B to estimate the UE's transmission timing and, if necessary, adjust the timing within a fraction of the cyclic prefix. As outlined in Non-Patent Document 5 (obtained at http://www.3pgg.org and incorporated by reference in this document), within the original cell, the mobile terminal uses an uplink synchronization code. Uplink timing adjustment information Δ1 can be acquired. The destination Node B can also receive the same uplink synchronization code and can estimate the timing adjustment information Δ2 that is consistent with its own timing. For example, the destination node B can feed back Δ2 to the original node B in the handover response message from the destination node B to the original node B. Therefore, for initial asynchronous random access after completion of the hard handover procedure, this information is not classified as “important” information because the UE does not need to obtain SIB7 information.

  Similar to the case of hard handover, the cell selection (reselection) procedure can also define important and non-critical SIBs. In one example, SIBs important for cell reselection can be SIB3 and SIB7, while SIB5 can be regarded as not important for services originating on the mobile terminal side.

  It should be noted that it is also possible to combine the transmission of the relevant SIBs in the fixed rate part and the variable rate part of the broadcast channel, depending on the timing for the reception of the individual messages.

Furthermore, another embodiment of the present invention is transmitted to the mobile node to change the mobile terminal's attachment point to the destination cell or to instruct the mobile terminal to connect to the destination cell Assume a situation where the control message is lost or cannot be successfully decoded by the mobile terminal. If the individual signaling message is lost, the control message can be retransmitted. In order to ensure the validity of the control message information related to the system information specific to the target cell, the SIB (that is, related system information) indicated in the control message can be retransmitted periodically in the target cell. . FIG. 17 shows the scenario described above. For illustrative purposes, a portion of the relevant system information (eg, SIB17 in case of handover) is mapped to the flexible rate portion of the BCCH of the target cell and transmitted periodically (repetition period T _rep ). I can assume.

If a control message needs to be retransmitted, the system frame number indicated in the control message may have changed in the meantime, causing problems in obtaining relevant system information in the target cell. There can be. Therefore, it can be foreseen to indicate the retransmission period T _rep to the mobile terminal. Based on the signaled retransmission period, the mobile terminal can then determine the correct SFN based on the repetition period and the (expired) SFN of the control message, which is repeated with relevant system information from the flexible part of the BCCH. Sometimes you can read. The repetition period of the (individual part) of the system information specific to the target cell is signaled to the mobile terminal by a radio resource control entity in the original cell, for example in a measurement setup / message, handover indication message or RRC connection release message Can be done. Implementation of the present invention according to this exemplary embodiment may be advantageous when implementing a SIB scheduled on the variable rate portion of the BCCH in a practically fixed manner.

  In another embodiment, the MAC PDU (s) carrying control messages that are retransmitted additional MAC PDUs carrying new scheduling information about the updated system frame number and / or related system information in the target cell. (Contrast FIG. 18). In this case, the realization of SIB transmission on the variable-rate part of the broadcast channel in the target cell is accordingly, but not limited to, RRC / MAC interaction in the Node B (RRC and More complex MAC implementations would be required, such as additional primitives that include new pointers between MACs.

  The SFN indicating the new scheduling information and the validity of this information for the destination node is a frame protocol via the interface between the original Node B and the destination Node B (eg X2 interface—see FIG. 2). It can be assumed that it is provided by the destination Node B in the application protocol message. Here, the frame protocol / application protocol message may be subject to protocol conversion to make it available to the RRC in the target Node B. The RRC layer of the target Node B can provide new scheduling information and SFN to the MAC layer in primitive form so that the information can be included in a separate PDU.

  The frame protocol or application protocol message containing the new scheduling information and SFN responds to the message from the original Node B notifying the destination Node B of the failure to transmit the control message to the UE in the original cell. And can be sent. As mentioned above, this unique implementation can allow for a more flexible implementation of scheduling system information on a variable rate transport channel in the destination cell, where the destination Node B It may be beneficial, for example, to address the current availability of resources on a variable rate transport channel such that the transmission format can be adjusted after a failure of the initial transmission of control messages to the UE.

In the case of cell reselection, there may be a number of neighboring radio cells as candidates that may be selected by the UE. Therefore, if it contains pointers to cell-specific system information for all neighboring cells that are potential destination cells, the overall size of the connection release message can become too large. In one exemplary embodiment of the present invention, the size of the information about the destination cell with potential cell reselection in a control message instructing the mobile terminal to change the attachment point of the mobile terminal is measured. It can be reduced in response to one of the following events that occur in the network based on the report.
-A new cell falls within the predetermined reporting range (ie, the measurement report indicates a channel quality above the threshold level). Add the cell to the cell list to report to the mobile terminal.
-A cell in the list leaves the reporting range (ie, the measurement report indicates channel quality below threshold level). Delete the cell from the cell list.

  As shown for exemplary purposes in FIG. 19, the mobile terminal can move along the moving direction and experience and report channel quality fluctuations of adjacent cells A-C due to the movement. The initial neighbor cell list maintained by the Node B currently serving the mobile terminal initially includes cell A, cell B and cell C, but when it finally moves in the direction of cell C, the neighbor cell The list will only contain cell B and cell C. Accordingly, when determining to send a connection release message to the mobile terminal according to the location of the mobile terminal, the connection release message from the currently serving Node B (original Node B) is the cell A to C. Pointers to related system information in each or each of B and C can be included.

  Further, as already briefly described above, the inventive concepts outlined in the various exemplary embodiments herein are described in the Background section, which may have, for example, the architecture illustrated in FIG. 1 or FIG. It should be noted that the present invention can be advantageously used in a mobile communication system. In this exemplary network architecture, a fixed rate transport channel (eg, a broadcast transport channel) and / or a variable rate transport channel (eg, a shared transport channel) is defined by a mobile station (UE). ) And the base station (Node B) can be used for uplink and / or downlink communication on the radio interface. For communication in the mobile communication system, for example, OFDM, MC-CDMA, or OFDM (OFDM / OQAM) using pulse shaping can be used. In some embodiments, the scheduler can schedule resources on a resource block basis (ie, subframe basis in the time domain) or transmission time interval (TTI) basis, where the TTI is in the time domain. It can be assumed that it consists of one or more subframes. In yet another embodiment, link adaptation techniques such as adaptive modulation and coding (AMC), transmit power control and / or HARQ may be applied to communications on the shared transport channel.

  In one embodiment of the invention, the shared transport channel has a bandwidth of 10 MHz and consists of 600 subcarriers with a 15 kH subcarrier spacing. The 600 subcarriers can be grouped into 24 subbands (each containing 25 subcarriers), and each subband occupies a bandwidth of 375 kHz. Assuming that the subframe has a length of 0.5 ms, the resource block (RB) is 375 kHz and spans 0.5 ms.

  Alternatively, one subband may be composed of 12 subcarriers, and 50 such subbands constitute 600 usable subcarriers. With a transmission time interval (TTI) of 1.0 ms corresponding to two subframes, in this example, the resource block (RB) will be 300 kHz in size over 1.0 ms.

  Another embodiment of the invention relates to the implementation of the various embodiments described above using hardware and software. It will be appreciated that the various embodiments of the invention may be implemented or implemented using computing devices (processors). A computing device or processor may be, for example, a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, etc. It can be. Various embodiments of the present invention may be implemented or implemented by a combination of the above devices.

  Furthermore, various embodiments of the present invention can also be implemented using software modules that are executed by a processor or directly embedded in hardware. A combination of software modules and hardware implementation is also possible. The software module can be stored on any kind of computer-readable storage medium 3/4, for example RAM, EPROM, EEPROM, flash memory, registers, hard disk, CD-ROM, DVD, etc. 3/4 Good.

  In the foregoing text, various embodiments of the present invention and variations thereof have been described. It will be understood by those skilled in the art that various changes and / or modifications to the invention shown in the form of specific embodiments can be made without departing from the spirit or scope of the invention as broadly described. I will.

  It should be further noted that most of the above embodiments have been outlined in relation to 3GPP-based communication systems, and the terminology used in the above sections is primarily related to 3GPP terminology. However, the terms and descriptions of the various embodiments involving 3GPP-based architectures are not intended to limit the principles and concepts of the present invention to the system described above.

  The detailed description given in the background section above is for better understanding of the exemplary embodiment mainly utilizing the features of 3GPP described in this document. It should not be understood that the present invention is limited to the specific implementations described herein of processes and functions. However, the improvements proposed in this document can be easily applied to the architecture described in the background section. Furthermore, the inventive concept can be easily used for LTE RAN currently under consideration by 3GPP.

Fig. 2 shows a high level architecture of UMTS according to UMTS R99 / 4/5. A typical UTRAN architecture from a 3GPP LTE research project is shown. 1 shows an overview of the UTRAN radio interface protocol architecture. The structure of a master information block (MIB) is shown. A typical deployment scenario, assuming a system bandwidth size of 15 MHz divided into three equally sized subbands and assuming that each device's inherent bandwidth capability is 5, 10 and 15 MHz. Indicates. FIG. 6 illustrates camping of a 10 MHz UE in a communication system with a 20 MHz system bandwidth when a fixed rate broadcast channel is provided near the center frequency of the system. 2 illustrates a typical hard handover procedure with UMTS. Figure 2 shows a typical cell reselection procedure according to UMTS. Fig. 5 shows a typical configuration of MIBs and SIBs on a broadcast transport channel using the MIB configuration of Fig. 4; A pointer to system information specific to the destination cell via the original cell according to an exemplary embodiment of the present invention when system information is mapped to a fixed rate transport channel and a variable rate transport channel. The concept of inclusion in a control message transmitted by FIG. 7 illustrates the concept of including a pointer to system information specific to a destination cell in a control message transmitted via the original cell according to another exemplary embodiment of the invention when system information is mapped. 11 includes a pointer indicating the mapping of system information blocks to fixed-rate and variable-rate transport channels during the first layer out-band signaling shown in FIG. 11 according to an embodiment of the present invention. A typical format of MIB is shown. Destination cell according to another exemplary embodiment of the present invention when system information is mapped to fixed rate and variable rate transport channels and layer 2 in-band signaling is used Fig. 4 illustrates the concept of including a pointer to specific system information in a control message transmitted via the original cell. 13 includes a pointer indicating the mapping of system information blocks to fixed-rate and variable-rate transport channels during layer 2 in-band signaling shown in FIG. 13 according to an embodiment of the present invention. A typical format of MIB is shown. A control message sent via the original cell with a pointer to the system information specific to the destination cell, according to another exemplary embodiment of the invention when parts of the system information are sent simultaneously in different resource blocks The concept of inclusion is shown below. In accordance with another exemplary embodiment of the present invention where a portion of system information is included in the control message, a pointer to system information specific to the destination cell is included in the control message transmitted via the original cell. Demonstrate the concept. A pointer to destination cell-specific system information is transmitted via the original cell according to another exemplary embodiment of the present invention when the repetition period of the destination cell-specific system information is indicated to the mobile terminal. The concept of the control message to be included in the retransmission is shown. FIG. 6 illustrates the concept of using an additional MAC PDU to transmit SFN and scheduling information updated by retransmission of a control message transmitted over the original cell, according to another embodiment of the present invention. Exemplary in situations where the neighbor cell list includes multiple cells and each pointer to cell specific system information for each cell will be included in the control message to the mobile terminal when performing the mobility procedure FIG. 6 illustrates neighbor cell list updates according to some embodiments. FIG.

Claims (47)

In a mobile communication system, a method for notifying a mobile terminal about system information specific to a destination cell, the method comprising:
Instructing the mobile terminal to change connectivity or attachment point from the original cell to the destination cell by a control message sent from the radio resource control entity of the original cell;
The method, wherein the control message comprises at least one pointer to destination cell specific system information.   The destination cell specific system information comprises information related to establishing connectivity on the radio interface of the destination cell or information related to changing an attachment point to the destination cell. The method of claim 1.   The mobile terminal according to claim 1 or 2, further comprising: the mobile terminal receiving system information specific to the destination cell in the destination cell using the at least one pointer included in the control information. Method.   4. The destination cell specific system information in the destination cell is mapped to a fixed rate transport channel or a variable rate transport channel. Method.   5. The pointer of claim 4, wherein the pointer indicates mapping of the destination cell specific system information to the fixed rate transport channel and / or the variable rate transport channel in the destination cell. Method.   The pointer includes a head system frame number from which scheduling information including transmission format and timing for at least a part of system information specific to the destination cell is valid. A method according to any of the above.   When retransmitting a control message according to a radio resource control protocol, the updated scheduling information including a transmission format and timing for at least a part of the updated system frame number or system information specific to the destination cell is indicated. The method according to claim 6, wherein a protocol data unit specific to a medium access control protocol is transmitted to the mobile terminal.   6. The method of claim 5, wherein the control message indicates a retransmission period or an updated system frame number that specifies an interval at which the destination cell specific system information is retransmitted in the destination cell.   The method according to claim 8, wherein the mobile terminal determines an updated system frame number based on the system frame number and the retransmission period.   The fixed rate transport channel is a broadcast transport channel having a fixed transport format, and the variable rate transport channel is a shared transport channel having a variable transport format. 10. A method according to any of claims 4 to 9, wherein the method is a broadcast transport channel.   The method according to any one of claims 1 to 10, wherein the system information specific to the destination cell is transmitted in the form of at least one system information block.   12. The method of claim 11, wherein the pointer indicates whether each system information block is mapped to a fixed rate transport channel and / or a variable rate transport channel in a destination cell. .   13. If a system information block is mapped to the variable rate transport channel, the pointer indicates the transmission format and timing of each system information block on the variable rate transport channel. The method described in 1.   If a system information block is mapped to the fixed rate transport channel, the pointer specifies the position of each system information block on the fixed rate transport channel in the destination cell, and 14. A method as claimed in claim 10 to claim 13, wherein a repetitive cycle in which system information blocks are retransmitted is selectively designated as needed.   The method further comprises the step of transmitting control information on a control channel associated with the variable speed transport channel, wherein the control information is a transmission format of each system information block transmitted on the variable speed transport channel. The method according to claim 5, wherein the timing is indicated.   The method of claim 15, wherein the control information further comprises an identification of a logical channel to transport channel mapping.   The pointer to the destination cell specific system information includes information regarding the configuration of at least one variable rate transport channel to which at least a portion of the destination cell specific system information is mapped. The method according to any one of claims 1 to 16, wherein:   The method according to any one of claims 1 to 17, wherein the control message includes a part of system information specific to the destination cell.   The method according to one of claims 1 to 18, wherein at least a part of the system information specific to the destination cell is transmitted simultaneously in at least two different resource blocks of the radio interface of the mobile communication system. .   The method according to claim 18 or 19, wherein the portion corresponds to information of at least one system information block.   The method according to one of claims 1 to 20, wherein the control message instructs the mobile terminal to attach to one of a plurality of possible neighboring cells.   The radio resource control entity that controls the original cell further comprises receiving at least one pointer from a radio resource control entity that controls an adjacent cell to adjacent cell-specific system information. Item 22. The method according to any one of Item 21.   The at least one pointer is received by a radio resource control entity of the original cell from a radio resource control protocol of the target cell via a frame protocol or an application protocol message. Method.   Among the cells that the mobile terminal may attach to when the adjacent cell is the destination cell for handover of the mobile terminal, or when the adjacent cell performs cell selection or cell reselection 24. The method according to claim 22 or 23, further comprising the step of including the pointer received from the neighboring radio resource control entity in the control message if one.   25. A mobile terminal connectivity or attachment change from an original cell to a destination cell is part of a handover procedure, a cell selection procedure or a cell reselection procedure. The method described.   The system information specific to the destination cell related to system information that dynamically changes in the destination cell is indicated by the pointer in the control message, while the destination cell related to system information that does not change dynamically 26. A method according to any of claims 1 to 25, wherein specific system information is included in the control message.   Destination cell specific system information related to important system information of the destination cell is pointed to by the pointer in the control message, while destination cell specific system information related to unimportant system information is: 26. A method according to any of claims 1 to 25, wherein the method is not pointed to by the pointer included in the control message and is not included in the control message.   28. The method of claim 27, wherein the critical system information is information necessary to perform a mobility procedure.   Important system information that the mobile terminal must acquire in order to perform a hard handover procedure is information relating to the setting of a common physical channel in the destination cell and / or setting of a shared physical channel in the destination cell 29. A method according to claim 27 or claim 28, wherein the method is information.   Important system information that the mobile terminal has to acquire in order to perform a cell selection or cell reselection procedure is information on cell selection parameters for the destination cell and / or the uplink interference in the destination cell 29. A method according to claim 27 or claim 28, wherein the method is information.   The method according to any one of claims 1 to 30, wherein the system information specific to the destination cell is periodically transmitted in the destination cell.   32. A method as claimed in any preceding claim, wherein the control message is a radio resource control protocol message.   The method according to any one of claims 1 to 32, wherein the system information specific to the destination cell is system information transmitted on a broadcast control logical channel of the destination cell. In the mobile communication system, a radio resource control device for notifying the mobile terminal served by the radio resource control device about system information specific to the destination cell,
Communication for instructing the mobile terminal to change connectivity or attachment point from the original cell served by the radio resource control device to the destination cell by transmitting a control message to the mobile terminal A unit,
The radio resource control apparatus, wherein the control message includes at least one pointer to system information specific to a destination cell in the destination cell.   35. The radio resource control device according to claim 34, wherein the communication unit is operable to receive each pointer from at least one neighboring cell to neighboring cell specific system information.   36. The radio resource control apparatus according to claim 35, wherein at least one pointer received from an adjacent cell is included in the control message.   37. The radio resource control apparatus according to claim 34, wherein the control message is an individual message transmitted to the mobile terminal.   38. The communication unit according to claim 34, wherein the communication unit is adapted to send a pointer to system information specific to a cell controlled by the radio resource controller to at least one neighboring radio resource controller. The radio resource control device according to any one of the above.   40. The radio resource control device according to claim 38, wherein the pointer relating to cell-specific system information controlled by the radio resource control device is transmitted in at least one application protocol or frame protocol message.   40. A device according to any one of claims 34 to 39, further comprising means adapted to perform the method according to any one of claims 1 to 33. Radio resource control device. A mobile terminal used in a mobile communication system;
A communication unit for receiving a control message instructing the mobile terminal to change connectivity or attachment point from the original cell to the destination cell, wherein the control message is a radio resource control of the original cell; Received from the device, the control message comprises at least one pointer to destination cell specific system information;
The mobile terminal is configured to attach or connect to the destination cell using the pointer to system information specific to the destination cell included in the control message.   42. The mobile terminal according to claim 41, further comprising means adapted to perform the method as defined in any one of claims 1 to 33.   A communication system comprising the radio resource control device according to any one of claims 34 to 40 and the mobile terminal according to claim 41 and claim 42. A command for operating the radio resource control device so as to notify the mobile terminal served by the radio resource control device about the system information specific to the destination cell when executed by the processor of the radio resource control device. A computer-readable medium for storing
Notification of system information specific to the target cell changes the connectivity or attachment point from the original cell served by the radio resource control device to the target cell by sending a control message to the mobile terminal Is done by giving instructions to the mobile terminal,
The control message is a computer readable medium comprising at least one pointer to destination cell specific system information within the destination cell.   34. When executed by a processor of the radio resource control device, instructions for operating the radio resource control device to execute the steps of the method as claimed in any one of claims 1 to 33. 45. The computer readable medium of claim 44, further storing. When executed by a processor of a mobile terminal in a mobile communication system,
Receiving a control message instructing the mobile terminal to change connectivity or attachment point from the original cell to the destination cell, the control message being received from the radio resource controller of the original cell, and the control The message contains at least one pointer to system information specific to the destination cell,
Attach or connect to the destination cell using the pointer to system information specific to the destination cell included in the control message;
A computer readable medium that stores instructions. When further executed by a processor of the mobile terminal, further storing instructions for operating the mobile terminal to perform the steps of the method according to any one of claims 1 to 33; The computer readable medium of claim 46.

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